メタデータ
| 項目 |
値 |
| Designation |
C/2017 E3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-06-06T23:41:41.795520Z |
| Orbit solution date (soln_date, UTC) |
2022-07-19T01:12:15Z |
| Obs used |
620 |
| NEO |
- |
| M1 |
5.700 |
| K1 |
10.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2018-03-26.0000000 |
| e |
1.01291206 |
| q (au) |
5.926129 |
| a (au) |
-458.960808 |
| i (deg) |
70.717015 |
| Ω (om, deg) |
220.742632 |
| ω (w, deg) |
334.279194 |
| M (ma, deg) |
0.029271 |
等級
散乱 + 全体線形
$$
M_a = (5.638 + 3.939\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.638 |
| n |
3.939 |
| gf |
0.887 |
| gb |
-0.947 |
| k |
1.000 |
| δ90 |
6.116 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
19:23:00.30 |
+48:35:10.8 |
HIP 95376 |
14.94 |
| 2026-03-26 12:00 |
19:23:03.90 |
+48:36:39.3 |
HIP 95376 |
15.49 |
| 2026-03-27 00:00 |
19:23:07.42 |
+48:38:08.0 |
HIP 95254 |
15.31 |
| 2026-03-27 12:00 |
19:23:10.88 |
+48:39:36.8 |
HIP 95254 |
14.00 |
| 2026-03-28 00:00 |
19:23:14.26 |
+48:41:05.7 |
HIP 95254 |
12.75 |
| 2026-03-28 12:00 |
19:23:17.57 |
+48:42:34.8 |
HIP 95254 |
11.58 |
| 2026-03-29 00:00 |
19:23:20.81 |
+48:44:03.9 |
HIP 95254 |
10.51 |
| 2026-03-29 12:00 |
19:23:23.98 |
+48:45:33.1 |
HIP 95254 |
9.56 |
| 2026-03-30 00:00 |
19:23:27.08 |
+48:47:02.5 |
HIP 95254 |
8.79 |
| 2026-03-30 12:00 |
19:23:30.10 |
+48:48:31.9 |
HIP 95254 |
8.25 |
| 2026-03-31 00:00 |
19:23:33.05 |
+48:50:01.4 |
HIP 95254 |
7.96 |
| 2026-03-31 12:00 |
19:23:35.93 |
+48:51:30.9 |
HIP 95254 |
7.97 |
| 2026-04-01 00:00 |
19:23:38.74 |
+48:53:00.6 |
HIP 95254 |
8.27 |
| 2026-04-01 12:00 |
19:23:41.47 |
+48:54:30.3 |
HIP 95254 |
8.82 |
| 2026-04-02 00:00 |
19:23:44.13 |
+48:56:00.1 |
HIP 95254 |
9.59 |
| 2026-04-02 12:00 |
19:23:46.72 |
+48:57:29.9 |
HIP 95254 |
10.53 |
| 2026-04-03 00:00 |
19:23:49.23 |
+48:58:59.8 |
HIP 95254 |
11.59 |
| 2026-04-03 12:00 |
19:23:51.67 |
+49:00:29.8 |
HIP 95254 |
12.74 |
| 2026-04-04 00:00 |
19:23:54.04 |
+49:01:59.7 |
HIP 95254 |
13.96 |
| 2026-04-04 12:00 |
19:23:56.33 |
+49:03:29.7 |
HIP 95254 |
15.23 |
| 2026-04-05 00:00 |
19:23:58.55 |
+49:04:59.8 |
HIP 95254 |
16.53 |
| 2026-04-05 12:00 |
19:24:00.70 |
+49:06:29.8 |
HIP 95254 |
17.87 |
| 2026-04-06 00:00 |
19:24:02.77 |
+49:08:00.0 |
HIP 95254 |
19.24 |
| 2026-04-06 12:00 |
19:24:04.77 |
+49:09:30.0 |
HIP 95254 |
20.61 |
| 2026-04-07 00:00 |
19:24:06.69 |
+49:11:00.1 |
HIP 95254 |
22.01 |
| 2026-04-07 12:00 |
19:24:08.54 |
+49:12:30.2 |
HIP 95254 |
23.41 |
| 2026-04-08 00:00 |
19:24:10.31 |
+49:14:00.3 |
HIP 95254 |
24.82 |
| 2026-04-08 12:00 |
19:24:12.01 |
+49:15:30.4 |
HIP 95575 |
24.99 |
| 2026-04-09 00:00 |
19:24:13.63 |
+49:17:00.5 |
HIP 95575 |
24.04 |
| 2026-04-09 12:00 |
19:24:15.18 |
+49:18:30.6 |
HIP 95575 |
23.17 |
| 2026-04-10 00:00 |
19:24:16.65 |
+49:20:00.6 |
HIP 95575 |
22.38 |
| 2026-04-10 12:00 |
19:24:18.04 |
+49:21:30.6 |
HIP 95575 |
21.68 |
| 2026-04-11 00:00 |
19:24:19.36 |
+49:23:00.5 |
HIP 95575 |
21.08 |
| 2026-04-11 12:00 |
19:24:20.61 |
+49:24:30.5 |
HIP 95575 |
20.58 |
| 2026-04-12 00:00 |
19:24:21.78 |
+49:26:00.3 |
HIP 95575 |
20.20 |
| 2026-04-12 12:00 |
19:24:22.87 |
+49:27:30.1 |
HIP 95575 |
19.94 |
| 2026-04-13 00:00 |
19:24:23.88 |
+49:28:59.9 |
HIP 95575 |
19.80 |
| 2026-04-13 12:00 |
19:24:24.82 |
+49:30:29.5 |
HIP 95575 |
19.79 |
| 2026-04-14 00:00 |
19:24:25.69 |
+49:31:59.1 |
HIP 95575 |
19.91 |
| 2026-04-14 12:00 |
19:24:26.47 |
+49:33:28.7 |
HIP 95575 |
20.15 |
| 2026-04-15 00:00 |
19:24:27.18 |
+49:34:58.1 |
HIP 95575 |
20.50 |
| 2026-04-15 12:00 |
19:24:27.82 |
+49:36:27.4 |
HIP 95495 |
20.64 |
| 2026-04-16 00:00 |
19:24:28.37 |
+49:37:56.7 |
HIP 95495 |
19.28 |